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- Title
Synthesis of porous silica from wasted SiO<sub>2</sub>‐containing molding compounds.
- Authors
Lai, Luo‐Yun; Chang, Chi‐Cheng; Hung, Yi‐Lun; Chiang, Tzu‐Hsing; Lin, Hong‐Ping; Hsu, Chun‐Han
- Abstract
Materials: In this study, we provided a simple method to extract the silicate species from the waste silica‐containing molding compounds from the semiconducting industry. Methods: Recycled sodium silicate solution was obtained from alkaline extraction of the silica fillers in the waste molding compounds and dried and redissolved in appropriate amount of water. Results: Porous silica of high surface area (>500 m2g−1) and tunable pore size (1.5–5.0 nm) could be feasibly synthesized by using the recycled sodium silicate as silica source and nature‐friendly homopolymer polyethylene glycol (PEG) as an organic template. The pore size of the PEG‐templating silicas was made tunable by hydrothermal treatment at different pH. Conclusion: To reduce the emission of CO2 gas from the removal of the PEG template, porous silica with a large surface area has been prepared at a low PEG/sodium silicate weight ratio of 1/20.
- Subjects
POROUS silica; CARBON dioxide mitigation; SOLUBLE glass; POROUS polymers; POLYETHYLENE glycol; SURFACE area; INORGANIC chemistry
- Publication
Journal of the Chinese Chemical Society, 2023, Vol 70, Issue 12, p2206
- ISSN
0009-4536
- Publication type
Article
- DOI
10.1002/jccs.202300340